Which film is credited with pioneering viral marketing in the film industry through its groundbreaking 'missing persons' campaign and mysterious online presence?

Test your knowledge of film industry marketing strategies! The success of a movie isn't just about great acting or directing - it's also about innovative marketing approaches that capture audience attention. This question focuses on a groundbreaking marketing campaign that changed how films are promoted and set new standards for the industry. Can you identify which revolutionary campaign transformed movie marketing forever?

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The Blair Witch Project (1999)
The Matrix (1999)
Fight Club (1999)
The Sixth Sense (1999)